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I am experimenting with Nesper (.NET version of Esper) and ran into a few troubles that I just cannot understand. The following simple EPL (modeled after the tutorial) fails with an error:

select * from pattern [every (e1=SeenEvent -> e2=SeenEvent(ID=e1.ID)) 
where timer:within(1 min)]

The error I get is:

Property named 'ID' is not valid in any stream

My first suspect was the ID may not be exposed correctly in the SeenEvent class which derives from Observation class. But I confirmed that in Observation class property ID is defined as Public.

Is this a known issue with EPL? Is Nesper different from Esper (it's Java cousin)?

Rajiv
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1 Answers1

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You could try "select ID from SeenEvent" to confirm whether "ID" is actually exposed. The property names are case-sensitive, try "id" as well. Rename the property may also help.

user650839
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